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Browse Prior Art Database

Capacitive Write Into Storage System

IP.com Disclosure Number: IPCOM000093943D
Original Publication Date: 1966-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 68K

Publishing Venue

IBM

Related People

Clapper, GL: AUTHOR

Abstract

The system provides a direct write-in input to a data processing system where the write-in information is to be stored in a matrix of suitable storage units. The system shown in A utilizes the electrical field that extends from a point of shielded stylus or probe 3, connected to the output of an AC source such as the 40 kilocycle multivibrator 5. Capacitive write-in tablet 7 includes a plurality of horizontal and vertical pickup lines each bounded by a ground or shield wire. The horizontal and vertical leads are connected through high-gain amplifiers 9 and 11, Inverters 13 and 15, and line drivers 17 and 19 to the row and column inputs of a matrix of storage units.

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Capacitive Write Into Storage System

The system provides a direct write-in input to a data processing system where the write-in information is to be stored in a matrix of suitable storage units. The system shown in A utilizes the electrical field that extends from a point of shielded stylus or probe 3, connected to the output of an AC source such as the 40 kilocycle multivibrator 5. Capacitive write-in tablet 7 includes a plurality of horizontal and vertical pickup lines each bounded by a ground or shield wire. The horizontal and vertical leads are connected through high-gain amplifiers 9 and 11, Inverters 13 and 15, and line drivers 17 and 19 to the row and column inputs of a matrix of storage units. Current interlock device 21 together with constant current generators 23 and 25 insures that during movement of the probe 3 over tablet 7 only one storage unit comes on at a time.

The write-in tablet shown at B includes a plurality of vertical signal lines 29 and a plurality of horizontal signal lines 31, each of which is adjoined on each side by a shield or ground wire such as the wires 33 and 35. The vertical and horizontal signal wires and the ground wires are interwoven as shown to reduce the extraneous pickup and shielding effects which would be present if all of the vertical or all of the horizontal wires overlayed all of the wires in the other direction. This basket weave construction results in uniformity of the signals picked up from probe 3 as it is moved...